I just got a chance to double check, and the Ogrillon (male ogre / female orc crossbreed), and the Orog (male orc / female ogre crossbreed) are in fact, both listed in the Tome of Horrors vol. one (although I am checking the revised 3.5 edition pdf of that book). There are differences between the two races. The stats seem sound in this edition despite not being an official WotC product. Overall the ToH1 is one really great book to have a copy of.
The Bestiary of the Realms version for the ogrillon may be a little closer to official because WotC typically employs those writers for official books. I have not checked for differences between the two versions.